Sources for the Barbarian Invasions
Coulston, J. C. N. (1990). Later Roman armour, 3rd-6th centuries AD. Journal of Roman Military Equipment Studies, 1, 139-160.
Graves, R. (1938). Count Belisarius. Penguin.Presents a good argument for mail armour, and against leather armour, in the late Roman army. Unfortunately my own Legionaries have leather armour.
Quite a good novel. Overdoes the evil Justinian thing, but still worth a read.
Nelson, L. H [Trans.] (1991). The Chronicle of San Juan de la Pena: A Fourteenth-Century Official History of the Crown of Aragon. University of Pennsylvania Press.
I only used this for the list of Visigothic Kings.